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i have read somewhere that it is possible that you can wrap some old inner tube around the expansion chamber, wich i did, but i can't really tell how much difference there is.i never got it tested for DB
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I had a KX250 that I experimented on as you describe. I had an Answer sneaker silencer on it which was a quiet silencer. I had heard of people wrapping the fat part of the pipe with inner tube and although they reported an improvement in sound output they said they had a persistent rubber smell that was annoying. I wrapped the pipe first with that fiberglass heat wrap that drag racers use. Then I wrapped it with inner tube. I didn't notice any smell and the bike was REALLY quiet. Quietest bike I ever had. The only problem was that it caused the pipe to rust really badly underneath all that wrapping.
You make the call, how bad do you want it to be that quiet?